# SparseConvertFromCoordinate(_:_:_:_:_:_:_:_:) Converts from coordinate format arrays to a matrix of real double-precision values, dropping out-of-range entries and summing duplicates. ``` func SparseConvertFromCoordinate(_ rowCount: Int32, _ columnCount: Int32, _ blockCount: Int, _ blockSize: UInt8, _ attributes: SparseAttributes_t, _ row: UnsafePointer, _ column: UnsafePointer, _ data: UnsafePointer) -> SparseMatrix_Double ``` ## Parameters `rowCount` The number of rows in the structure. `columnCount` The number of columns in the structure. `blockCount` The number of blocks in the matrix. `blockSize` The block size for data storage on both input and output. `attributes` The attributes of the matrix to create. The conversion forces the matrix to conform to the specified attributes by copying or dropping elements as necessary. `row` The row indices of the matrix structure. `column` The column indices of the matrix structure. `data` The contents of the structurally nonzero (block) matrix elements. ## Return Value A new [`SparseMatrix_Double`](/documentation/Accelerate/SparseMatrix_Double) object. After you finish using a sparse matrix, call [`SparseCleanup(_:)`](/documentation/Accelerate/SparseCleanup(_:)-6ywzn) to release its references to any memory that the Sparse Solvers library allocates. ## Discussion The conversion drops out-of-range entries, and sums duplicate entries. You may supply entries in either triangle for symmetric matrices. The conversion transposes entries in the triangle that [`triangle`](/documentation/Accelerate/SparseAttributes_t/triangle) doesn’t specify, and sums duplicate entries. For triangular matrices, the conversion drops entries in the triangle that [`triangle`](/documentation/Accelerate/SparseAttributes_t/triangle) doesn’t specify. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)